Integration of an On-Axis General Sun-Tracking Formula in the Algorithm of an Open-Loop Sun-Tracking System. - Kok-Keong Chong; Chee-Woon Wong; Fei Lu Siaw; Tiong-Keat Yew; See-Seng Ng; Meng-Suan Liang; Yun Seng Lim; Sing-Liong Lau (Sensors, 2009)